Barrel Jellyfish (Rhizostoma pulmo/octopus)

A barrel jellyfish was seen about 50 metres off the Vico yesterday.
Today it was still there. Here's a photo (it's not a plastic bag)

 If I didn't know better I'd think it was smart. It swum over to the steps, had a sniff(?) around the swimmers, and then swum back out again.
Good video of a barrel jellyfish (not this one) here.
I'm going to try to teach it to jump for fish tomorrow.